166 J. B. Hatcher — Recent and Fossil Tapirs. 



the same locality and the same horizon, agrees perfectly, in 

 size, with the type, and I have referred it to the same species, 

 and made it a collateral type, figuring it in position in fig. 1, 

 plate II. The inferior border is gently convex, the angle is 

 slightly deflected, and its border turned inward, as in recent 

 Tapirs. The mental foramen is a little in front of pm. 2. 

 The symphysis is long and much constricted, as in Tapirus. 



The teeth : Incisors 1 and 2 are of about equal size and much 

 larger than I. 3, which is quite small, they are all spatulate and 

 slightly cupped. The canine is small, conical and placed close 

 to I. 3. The number of the inferior premolars is reduced to 

 three. There is a long diastema between the canine and pm. 

 2. All of the pms. have two anterior cones, united by cross- 

 crests notched in the middle ; these cross crests are better devel- 

 oped in pms. 2 and 3 than in pm. 4, as has been shown to be 

 the case in the posterior cross-crests of the sup. pms. The 

 antero-external cone is situated farther forward than the antero- 

 internal. There are also two posterior cones, but no posterior 

 cross-crest ; the postero-internal is the smaller and there is a low 

 ridge running obliquely forward and inward from the postero- 

 external cone and uniting with the base of the cross-crest. In 

 addition to the elements already described there is a fifth cusp 

 on the anterior border of pm. 2. The true molars each have 

 two anterior and two posterior cones connected by high, sharp 

 cross-crests. There are anterior and posterior basal cingula on 

 all the inf. molars and premolars, but no external or internal 

 cingula. The principal characters of the inf. dentition are 

 well shown in fig. 4, plate II. 



The Atlas : The articular surfaces for the occipital condyles 

 are deep ; those for the axis are of only moderate extent and 

 curve inward exteriorly. There is a short dorsal spine, and a 

 small posterior protuberance on the inferior arch. The trans- 

 verse processes are only moderately expanded laterally, and pos- 

 teriorly they extend but little beyond the articular surfaces for 

 the axis. There is a vertebrarterial canal, and foramina, for 

 the inferior and superior branches of the first spinal nerve. 

 The present specimen agrees in every essential character with 

 the atlas of Elasmognathus bairdii* 



The fore limb : The humerus is proportionately rather 

 strong and does not differ materially from that bone in recent 

 Tapirs. The head is broad and sub-triangular in cross-section ; 

 the articular surface is continued upon the inner surface of 

 the greater tuberosity, which is much larger than the lesser, 

 and is produced, anteriorily, into an obtuse point which over- 

 hangs the bicipital groove. The deltoid ridge is prominent, 



* An atlas of E. bairdii in the Princ. Ooll. has the vertebrarterial canal present 

 on one side and absent on the other. 



